import 'dart:async';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/mockito.dart';
import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';

// 创建模拟QRViewController类
class MockQRViewController extends Mock implements QRViewController {
  @override
  Stream<Barcode> get scannedDataStream => _scanUpdateController.stream;

  final StreamController<Barcode> _scanUpdateController = StreamController<Barcode>();

  @override
  Future<CameraFacing> flipCamera() async {
    return super.noSuchMethod(Invocation.method(#flipCamera, []), returnValue: Future.value(CameraFacing.front)) as Future<CameraFacing>;
  }

  @override
  Future<bool?> getFlashStatus() async {
    return super.noSuchMethod(Invocation.method(#getFlashStatus, []), returnValue: Future.value(false)) as Future<bool?>;
  }

  @override
  Future<void> toggleFlash() async {
    return super.noSuchMethod(Invocation.method(#toggleFlash, []), returnValue: null);
  }

  @override
  Future<void> pauseCamera() async {
    return super.noSuchMethod(Invocation.method(#pauseCamera, []), returnValue: null);
  }

  @override
  Future<void> resumeCamera() async {
    return super.noSuchMethod(Invocation.method(#resumeCamera, []), returnValue: null);
  }

  @override
  Future<void> stopCamera() async {
    return super.noSuchMethod(Invocation.method(#stopCamera, []), returnValue: null);
  }

  @override
  Future<CameraFacing> getCameraInfo() async {
    return super.noSuchMethod(Invocation.method(#getCameraInfo, []), returnValue: Future.value(CameraFacing.back)) as Future<CameraFacing>;
  }

  // 用于测试的额外方法
  void addBarcode(Barcode barcode) {
    _scanUpdateController.sink.add(barcode);
  }

  void disposeStream() {
    _scanUpdateController.close();
  }
}

void main() {
  // 初始化测试绑定
  TestWidgetsFlutterBinding.ensureInitialized();
  late MockQRViewController controller;
  late CameraFacing cameraFacing;

  setUp(() {
    // 初始化相机朝向
    cameraFacing = CameraFacing.back;

    // 创建模拟控制器
    controller = MockQRViewController();

    // 设置模拟行为
    when(controller.getFlashStatus()).thenAnswer((_) async => false);
    when(controller.toggleFlash()).thenAnswer((_) async => null);
    when(controller.pauseCamera()).thenAnswer((_) async => null);
    when(controller.resumeCamera()).thenAnswer((_) async => null);
    when(controller.stopCamera()).thenAnswer((_) async => null);
    when(controller.getCameraInfo()).thenAnswer((_) async => cameraFacing);
    when(controller.flipCamera()).thenAnswer((_) async {
      cameraFacing = cameraFacing == CameraFacing.front ? CameraFacing.back : CameraFacing.front;
      return cameraFacing;
    });
  });

  tearDown(() {
    // 清理流控制器
    controller.disposeStream();
  });

  group('QRViewController测试', () {
    test('相机翻转功能', () async {
      // 初始相机朝向为背面
      expect(cameraFacing, CameraFacing.back);

      // 翻转相机
      final newCameraFacing = await controller.flipCamera();

      // 验证相机朝向已更改为正面
      expect(newCameraFacing, CameraFacing.front);
      expect(cameraFacing, CameraFacing.front);

      // 再次翻转相机
      final newCameraFacing2 = await controller.flipCamera();

      // 验证相机朝向已更改为背面
      expect(newCameraFacing2, CameraFacing.back);
      expect(cameraFacing, CameraFacing.back);
    });

    test('闪光灯功能', () async {
      // 初始闪光灯状态应为关闭
      bool? initialFlashStatus = await controller.getFlashStatus();
      expect(initialFlashStatus, false);

      // 切换闪光灯
      await controller.toggleFlash();

      // 验证闪光灯状态已更改
      when(controller.getFlashStatus()).thenAnswer((_) async => true);
      bool? newFlashStatus = await controller.getFlashStatus();
      expect(newFlashStatus, true);

      // 再次切换闪光灯
      await controller.toggleFlash();

      // 验证闪光灯状态已更改回关闭
      when(controller.getFlashStatus()).thenAnswer((_) async => false);
      bool? finalFlashStatus = await controller.getFlashStatus();
      expect(finalFlashStatus, false);
    });

    test('相机暂停和恢复功能', () async {
      // 测试暂停相机
      expect(() async => await controller.pauseCamera(), returnsNormally);

      // 测试恢复相机
      expect(() async => await controller.resumeCamera(), returnsNormally);

      // 测试停止相机
      expect(() async => await controller.stopCamera(), returnsNormally);
    });

    test('获取相机信息功能', () async {
      // 设置相机朝向为背面
      cameraFacing = CameraFacing.back;

      // 获取相机信息
      final cameraInfo = await controller.getCameraInfo();

      // 验证相机信息正确
      expect(cameraInfo, CameraFacing.back);

      // 切换相机朝向
      cameraFacing = CameraFacing.front;

      // 再次获取相机信息
      final cameraInfo2 = await controller.getCameraInfo();

      // 验证相机信息正确
      expect(cameraInfo2, CameraFacing.front);
    });

    test('二维码扫描流功能', () async {
      // 监听扫描流
      final scanResults = <Barcode>[];
      controller.scannedDataStream.listen((barcode) {
        scanResults.add(barcode);
      });

      // 模拟接收到二维码
      final testBarcode = Barcode('test_qr_code', BarcodeFormat.qrcode, [1, 2, 3, 4, 5]);
      controller.addBarcode(testBarcode);

      // 等待流处理
      await Future.delayed(const Duration(milliseconds: 100));

      // 验证扫描结果
      expect(scanResults.length, 1);
      expect(scanResults[0].code, 'test_qr_code');
      expect(scanResults[0].format, BarcodeFormat.qrcode);
      expect(scanResults[0].rawBytes, [1, 2, 3, 4, 5]);
    });
  });
}
